Improvement in lifting-jacks



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TIMOTHY R. DAY, OF DEVALLS BLUFF, ARKANSAS, ASSIGNOR OF TWO- THIBDS HISRIGHT TO J. M. MCOLINTOOK AND'PAT. H. WHEAT, OF SAME PLACE.

IMPROVEMENT IN LlFTlNG-JACKS.

Specification forming part of Letters Patent No. 193,93 R, dated August7, 1877; application filed June 23, 1877.

To all whom it may concern Be it known that I, TLMO'rHY R. DAY, ofDevalls Bluff, in the county of Prairie and State of Arkansas, haveinvented certain new and useful Improvements in Wagon-Jacks; and 1 dohereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art towhich it appertains to make and use the same, reference being-had to theaccompanying drawings, which form a part of this specification, and inwhich a Figure l is a side elevation of the jack standing at fulllength. Fig. 2 is a similar view, the joint being bent. Fig. 3. is aperspective view of the lower end of the upper piece A detached; andFig. 4 is a longitudinal vertical section of the jack complete.

This invention relates to that class of devices which are used forlifting the sides of carriages and wagons for the purpose of detachingor lubricating the wheels; and it consists, first, in the constructionof the lever, which is self-setting, and so arranged as to prevent thewagon from sliding off while being lifted and, secondly, in theconstruction of the joint, by which the jack may be adjusted to wagonsof different heights,-all as hereinafter more fully shown and described.ln the drawings, A is apost or upright, having at its upper end arecess, b, in which is pivoted a lever, B. The end of this has a curvedrecess, 0, thus presenting two points, a (1,. The end of the leveritself is curved, as shown at d, and shod with iron, the body of thelever being made of wood. The lower end of upright A is tenoned, asshown at e 0, so as As will be seen by reference to'the accompanyingdrawings, the peculiar construction of the joint by which the upright Aand block 0 are connected (or the slot is, which takes the place of anordinary pivot-hole) enables thejack to be adjusted in either of thepositions shown in Figs. 1 and 2, the difl'erence in height being equalto the difference between the height and width of the block 0. In eithercase the upright A rests firmly upon the square shoulders formed by thetenons e e.

The operation of my improved wagon-jack is obvious, and requires noexplanation. The construction of the lever enables it to be used withequal advantage for square and round axles, the curve of the leverpreventing slipping, and when the wagon is raised the body will besupported by the points a a, which being, when raised, upon the side ofthe fulcrum of the lever, retain it in its elevated position as long asdesired.

Having thus described my invention, I

TIMOTHY R. DAY.

Witnesses: I

J. M. MoOLIN'rocK, JAMES LOVEJOY.

